The specific epithet rectum is from the Latin meaning 'upright', referring to the inflorescences.

[2] Xanthophyllum rectum grows up to 12 metres (40 ft) tall with a trunk diameter of up to 20 centimetres (8 in).

The dark brown fruits are round and measure up to 1.8 cm (1 in) in diameter.

[2] Xanthophyllum rectum is endemic to Borneo and confined to Sarawak.

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